Lucent Technologies Comcode 108678723 manual GL-2

DEFINITY ECS Release 8.2 ATM Installation,	Issue 1
Upgrades, and Administration 555-233-124	April 2000
Glossary and Abbreviations
	GL-2

C

CBR

Constant bit rate—Digital information, such as video and digitized voice, that is represented by a continuous stream of bits. CBR traffic requires guaranteed throughput rates and service levels.

CES

Circuit Emulation Service—a connection over an ATM PVC-based network that provides

end-to-end service, sometimes called virtual trunking. Conforms to CES ATM Forum VTOA-78 Interoperability Specifications (CES-IS).

CDV

Cell delay variation, which measures the allowable variance in delay between one cell and the next, expressed in fractions of a second. When emulating a circuit, CDV measurements allow the network to determine if cells are arriving too fast or too slow.

CMC

Compact Modular Cabinet

CSCC

Compact Single Carrier Cabinet

CSS

Center Stage Switch—the central interface between the processor port network (PPN) and the expansion port networks (EPN).

CSU

Channel service unit

D

DCS

Distributed Communication System

DS1

Digital Signal, Level 1—The 1.544 Mbps digital signal format defined for operation in the international digital hierarchy.

DSU

Data service unit

DTE

Data terminal equipment

E

EI

Expansion interface

EPN

Expansion port network